They fell in love in high school. She was going to the United States due to illness. Before leaving, she thought she had no chance to come back, leaving only "I don't love you anymore." This was his most difficult moment, but she left him. From then on, he only felt hatred for her in his heart. . . . Five years later, she returns as a pediatrician and he decides to take revenge on her. The misunderstanding was resolved, and it turned out that there was just one missing explanation between them. . . One day, she was at work, and suddenly he appeared in front of her. "Why are you here?" "You are seeing a doctor." "This is pediatrics." "I know." Speechless. . . .